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פורסם במקור על ידי גל ציון-פור

ולאחר 3 עמודים של דיון,
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A study by the University of North Dakota compared muscle recruitment during a leg press and a free weight barbell squat lift (5). The study used two groups of subjects. Group 1 was made up of ten untrained, healthy men, and Group 2 was made up of sixteen trained, healthy male athletes (5). The analysis method used was electromyographic (EMG) activity (5). EMG activity was recorded from the erector spinae (ES), gluteus maximus (GM), vastus lateralis (VL), and biceps femoris (BF) muscles (5). The exercises performed were the leg press and the barbell squat lift (5).

Every subject in Group 1 lifted three repetitions of both exercises using a weight equivalent to their own body weight, which ranged from 155 to 165 lbs. In Group 2, each subject performed three repetitions of both exercises using a weight equivalent to 80% of their 1 RM in both lifts, which ranged from 225 to 600lbs. (5). The results indicated that in Group 2, the trained group, the squat exercise elicited significantly more EMG activity than did the leg press in the ES, GM and BF (5). A significant difference in the VL activity was not observed between the two exercises, but the activity in the VL was still slightly greater (5). In the untrained group, Group 1, the results were almost a reflection of the trained group (5). The leg press utterly failed to recruit the ES, GM or BF to the degree the barbell squat did (5). The quadriceps were slightly more stimulated in the squat than in the leg press.

http://articles.elitefts.com/article...letic-prowess/

חבל על הזמן לבזבז על הבלבולי ביצים שלך
יש עוד הרבה חומר, ואם אתה לא רוצה לחפש אותו אז אל תחפש
כל מה שריפ אומר ומה שביל סטאר אומר מגובה מדעית
אני מציע לך לקנות את הספר של סטאר והרבה מהחומר שהוא רושם שם הוא מביא דוגמאות למחקרים


אתה יכול לעיין גם בספרים הבאים
"Journal of Strength and Conditioning Research"; An Electromyographical Comparison of the Squat and Knee Extension Exercises; J.F. Signorile, et al; August 1994
"Journal of Strength and Conditioning Research"; A Biomechanical Comparison of Back and Front Squats in Healthy Trained Individuals; J.C. Gullett, et al; January 2009
"Journal of Strength and Conditioning Research"; Electromyographic Activity of the Hamstrings During Performance of the Leg Curl, Stiff-Leg Deadlift, and Back Squat Movements; G.A. Wright, et al; May 1999
"Strength Training Anatomy (Third Edition)"; Frederic Delavier; 2010
"Starting Strength"; Mark Rippetoe and Lon Kilgore; 2007